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            margin: 0 auto;   
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        /* 
        css属性
         border-spacing 单元格和单元格之间的间距 table加
         table-layout 单元格宽度是否固定 auto fixed
         border-collapse 合并相邻单元格边框  separate 边框分开（不合并） collapse 边框合并
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           <td>雪在烧国雪在烧雪在烧佛大魂牵梦萦为魂牵梦萦为城区</td>
           <td></td>
           <td>3</td>
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       <tr>
            <td>1</td>
            <td>2</td>
            <td>3</td>
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       <tr>
            <td>1</td>
            <td>2</td>
            <td>3</td>
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       <tr>
            <td>1</td>
            <td>2</td>
            <td>3</td>
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